Map showing the Winton Formation Inland Sea
The Winton Dinosaurs are found in the lowermost Winton Formation, approximately 98-95 million years old.
These rocks are mudstones, shales, claystones, sandstones and carbon-rich shales that formed from sediments deposited in estuaries, streams, deltas, lakes and rivers. At this time the last of the great Cretaceous inland seas was retreating to the north...